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KCRA 3 meteorologist Mark Finan said the mountains might start to see some activity around 11 p.m. Thursday, but more rain and the possibility of thunderstorms are expected in the region beginning Friday morning.

At Haggin Oaks Golf Course, organizers are expecting a crowd of more than 20,000 this weekend for the 39th annual Gold Expo. They are also unveiling their new Mackenzie Putting Course, a nine-hole putting green with obstacles like a normal course.

The ribbon-cutting might be held in the rain.

"Light rain will be fine," said Mike Woods, the PGA director of golf at Haggin Oaks. "Heaver rain might get a little more challenging."

The rain might hurt attendance a little Friday, Woods said.

"We’ve had rain before," he said. "It shouldn’t be a problem."

The event is the largest of its kind in the country, according to industry experts.

Dozens of tents for golf products line the grounds. Golfers are able to come try the latest inventions for free.

"It’s our flagship event," Woods said. "It’s our oldest event. We do a lot of a great events that raise money for charity, but the golfers really look forward to this event because it kind of kicks off the year."

The rain also could have an impact on the construction taking place along the W/X section of Highway 50.

"Well, the problem is that you got these dowels that have to be inserted into the concrete -- into the holes that already exist," said Dennis Keaton, a spokesman for Caltrans.

If it rains too much, the metal rods can’t be sealed into the concrete deck on the highway.

Caltrans doesn’t expect it to be a big setback, if at all.

Finan said the weather system will likely keep temperatures below average for the next couple of days with the high around 65 degrees for Sacramento on Friday.

Saturday morning will start of on the cooler side with lows in the 40s, but will warm up to the upper 60s in the afternoon and will remain dry.